Automatic bookmark

ABSTRACT

An automatic bookmark ( 1 ) is composed of a quadrangular base sheet ( 5 ), a pair of coupling bodies ( 6   a,    6   b ) provided on one edge of the base sheet ( 5 ), a projecting body ( 13 ) provided between the coupling bodies ( 6   a,    6   b ), elastic bodies ( 12   a,    12   b ) connected on upper sides ( 29   a,    29   b ) which are the forward ends of the pair of coupling bodies ( 6   a,    6   b ) and provided with crease lines ( 15 ) in parallel with the upper sides ( 29   a,    29   b ) and a V-shaped bookmark body ( 27 ) connected to the forward ends of the elastic bodies ( 12   a,    12   b ) to oppose the base sheet ( 5 ). In use, this base sheet ( 5 ) is put between page sheets of a book, for holding a proper volume of page sheets between the base sheet ( 5 ) and the bookmark body ( 27 ). Thus, a side of the bookmark body ( 27 ) close to the fore edge of the book necessarily becomes a tilting inclining side ( 11   a ). Therefore, a turned page sheet comes into contact with the inclining side ( 11   a ), so that the bookmark body ( 27 ) is smoothly flapped up.

TECHNICAL FIELD

The present invention relates to an automatic bookmark, and moreparticularly, it relates to an automatic bookmark automatically putbetween two facing pages every time any page of a book is turned.

BACKGROUND TECHNIQUE

FIG. 9 is a general view of a conventional automatic bookmark.

Referring to the figure, the automatic bookmark 50 is composed of a basesheet 5 formed by a quadrangular synthetic resin sheet, a projectingportion 54 provided to outwardly project from a side of the base sheet 5and a strip-shaped bookmark body 51 of synthetic resin thermally weldedto the projecting portion 54. The base sheet 5, made of synthetic resinsuch as polyethylene or polypropylene, is elastic and flexibly bendable.The projecting portion 54 is a part of the base sheet 5, and thebookmark body 51 is made of synthetic resin such as polyethylene orpolypropylene. Therefore, the same has elasticity as well asflexibility. This bookmark body 51 is thermally welded to the projectingportion 54 at a fixing portion 53 on one end, while the other end iselongated toward the base sheet 5 and mounted to face the base sheet 5.The bookmark body 51 has an elastic body 52 in the vicinity of thefixing potion 53, and this elastic body 52 is colored while theremaining portion is achromatic and transparent.

The use of this automatic bookmark is now described.

FIG. 10 is a general view showing a state of putting the aforementionedautomatic bookmark between pages of a book, FIG. 11 is a frontelevational view showing the book holding this automatic bookmark from afore edge direction, FIG. 12 is a diagram showing a state of turning apage sheet of the book holding this automatic bookmark, and FIG. 13, adiagram corresponding to FIG. 12, is an enlarged view around thebookmark body.

Referring to these figures, the automatic bookmark 50 is set by puttingthe base sheet 5 between the pages of the book, largely flapping up thebookmark body 51, then superposing a proper volume of page sheets 17 onthe base sheet 5 and thereafter returning the bookmark body 51. When theautomatic bookmark 50 is put in this manner, the projecting portion 54projects from an upper surface 20 of the book, and the bookmark body 51hangs down from the projecting portion 54 toward the page surface. Whileit follows that the bookmark body 51 covers one of the facing pages atthis time, reading of the page surface is not hindered since thecovering portion is transparent.

The reader reads the facing pages in this state, and turns a page sheet17 after completely reading the same. Then, as shown in FIG. 13, anupper side 25 of the page sheet 17 comes into contact with a lateralside 55 a close to the fore edge 18 (see FIG. 12) of the bookmark body51. When the reader further turns the page sheet 17 up to a positionshown by two-dot chain lines, the point in contact with the bookmarkbody 51 moves from a contact 56 to another contact 57 toward thebackbone 19 (see FIG. 12). Following this, the bookmark body 51 isflapped up to a position shown by other two-dot chain lines. When thereader further turns the page sheet 17, the forward end of the bookmarkbody 51 passes the upper side 25 of the page sheet 17. When passing thispoint, the bookmark body 51 returns to the original position by elasticforce and covers the surface of one of new facing pages.

Thus, the bookmark body 51 automatically moves when the reader simplyordinarily reads the book 16. When the reader stops reading and closesthe book 16, it follows that the bookmark body 51 is regularly putbetween the final pages read by the reader.

High resistance is easily applied to the aforementioned conventionalautomatic bookmark since the bookmark body is flapped directly upwardwhen the reader turns the page sheet. When the automatic bookmark is setin a book and any page sheet is turned, therefore, the page sheet maynot be smoothly turnable.

The present invention has been proposed in order to solve theaforementioned problem, and aims at providing an automatic bookmarkallowing the user to smoothly turn a page sheet with no resistance.

DISCLOSURE OF THE INVENTION

In order to attain the aforementioned object, an automatic bookmarkaccording to a first aspect of the present invention is an automaticbookmark put between pages of a book, comprising a sheetlike base sheet,an elastic body provided on an edge of the base sheet and a sheetlikebookmark body connected to the elastic body through a connecting side toextend on a position opposing the base sheet, and a side of the bookmarkbody extending from one end of the connecting side inclines toward theother end of the connecting side with respect to a surface orthogonal tothe connecting side from the one end.

According to this structure, it follows that the inclining side of thebookmark body and an upper side of a page sheet come into contact witheach other and the bookmark body is flapped up when the page sheet isturned if the automatic bookmark is so set as to locate the incliningside of the bookmark body on the side of the fore edge of a book.

In the automatic bookmark according to a second aspect of the presentinvention, the bookmark body is in the form of an isosceles-triangularsheet whose base is connected to the connecting side of the base sheetin the structure of the present invention according to the first aspect.

According to this structure, it follows that the side of the bookmarkbody located close to the fore edge regularly inclines inward whetherthe automatic bookmark is set in a rightwardly or leftwardly openedbook. Therefore, it follows that the inclining side of the bookmark bodyand an upper side of a page sheet necessarily come into contact witheach other and the bookmark body is flapped up when the page sheet isturned.

An automatic bookmark according to a third aspect of the presentinvention is an automatic bookmark put between pages of a book,comprising a sheetlike base sheet, a pair of elastic bodies connected tothe respective ones of positions separated from each other by aprescribed distance on an edge of the base sheet and a V-shapedsheetlike bookmark body, connected to the respective ones of the elasticbodies, extending toward positions opposing the base sheet.

According to this structure, it follows that the side of the bookmarkbody located close to the fore edge regularly inclines inward whetherthe automatic bookmark is set in a rightwardly or leftwardly openedbook. Therefore, it follows that the inclining side of the bookmark bodyand an upper side of a page sheet necessarily come into contact witheach other and the bookmark body is flapped up when the page sheet isturned. Further, the respective ones of bookmark pieces constituting therespective sides of the V shape are bonded to each other only on theforward ends. Therefore, mutual movements of the respective bookmarkpieces are relatively free. When the page sheet is turned, therefore,one of the bookmark pieces coming into contact with the upper side ofthe page sheet is flapped up in advance and the other bookmark piece isflapped up in a delayed manner.

In the automatic bookmark according to a fourth aspect of the presentinvention, the elastic bodies are provided with at least single creaselines parallel to a line connecting the respective ones of the positionswith each other in the structure of the present invention according tothe third aspect.

According to this structure, it follows that the elastic bodies keepstates bent on the portions of the crease lines. When the elastic bodiesare so folded through the crease lines that the base sheet and thebookmark body parallelly oppose each other, therefore, it follows thatthe parallel state is stably maintained.

In the automatic bookmark according to a fifth aspect of the presentinvention, the base sheet has two coupling bodies projecting from oneside thereof, and the respective ones of the elastic bodies areconnected to the forward ends of the respective ones of the couplingbodies in the structure of the present invention according to the thirdaspect or the fourth aspect.

According to this structure, it follows that the elastic bodies arelocated on portions separating from a reference side of the base sheetby the coupling bodies. Thus, the elastic bodies project from the uppersurface of a book even if sides of the coupling bodies and the uppersurface of the book are rendered flush with each other when theautomatic bookmark is set in the book.

In the automatic bookmark according to a sixth aspect of the presentinvention, the base sheet, the elastic bodies and the bookmark body areformed by folding a synthetic resin sheet in the structure of thepresent invention according to the third aspect to the fifth aspect.

According to this structure, the automatic bookmark can be manufacturedfrom a single sheet.

As hereinabove described, the inclining side of the bookmark body and anupper side of a page sheet come into contact with each other when theautomatic bookmark is set in a book and the page sheet is turned in theautomatic bookmark according to the first aspect. The bookmark body isflapped up by force for turning this page sheet. Thus, force forflapping up the bookmark body may be weak since the side of the bookmarkbody inclines. Therefore, the page sheet can be smoothly turned sincethe force for turning the page sheet may also be weak.

In the automatic bookmark according to the second aspect of the presentinvention, it follows that the side of the bookmark body located closeto the fore edge regularly inclines inward when the automatic bookmarkis set in a book regardless of whether the book is rightwardly orleftwardly opened, in addition to the effect according to the firstaspect of the present invention. Thus, it is possible to cope with bothof rightwardly and leftwardly opened books with a single automaticbookmark, whereby it is not necessary to prepare two types of automaticbookmarks.

In the automatic bookmark according to the third aspect of the presentinvention, it follows that the side of the bookmark body located closeto the fore edge necessarily inclines inward when the automatic bookmarkis set in a book regardless of whether the book is rightwardly orleftwardly opened, since the bookmark body of the automatic bookmark isV-shaped. Thus, it is possible to cope with both of rightwardly andleftwardly opened books with a single automatic bookmark, whereby it isnot necessary to prepare two types of automatic bookmarks. When thisautomatic bookmark is put between pages of the book and a page sheet isturned, the inwardly inclining side of the bookmark body and the upperside of the page sheet flap up the bookmark body while coming intocontact with each other. Since the respective ones of the bookmarkpieces constituting the respective sides of the V shape can relativelyfreely move at this time, the bookmark piece coming into contact withthe page sheet is flapped up in advance and the other one is flapped upin a delayed manner. Thus, a side of the bookmark body is brought into astate simply twisted with weak force when force is applied thereto.Therefore, force for flapping up the bookmark body may be weak. Thus,force for turning the page sheet may be weaker, and the operation ofturning the page sheet is smoothed. Thus, the bookmark sheet is easy tohandle.

The automatic bookmark according to the fourth aspect of the presentinvention forms the state where the base sheet and the bookmark body areparallel to each other by forming the crease lines in the elasticbodies, in addition to the effect according to the third aspect of thepresent invention. Therefore, this form is stably maintained. Thus, nocrease disappears even if the bookmark body is repeatedly flapped up butthe state where the base sheet and the bookmark body are parallel toeach other can be kept long. Therefore, durability of the automaticbookmark is improved.

In the automatic bookmark according to the fifth aspect of the presentinvention, the elastic bodies project from the upper surface of a bookeven if sides of the coupling bodies and the upper surface of the bookare rendered flush with each other when the automatic bookmark is set inthe book, in addition to the effect according to the third aspect or thefourth aspect of the present invention. Therefore, the position of thebookmark body is easy to visually recognize when reading is stopped andthe book is closed. On the other hand, the reference side of the basesheet can be set not to project from the upper surface of the book bythe height of the coupling bodies, whereby the automatic bookmark iseasy to handle.

The automatic bookmark according to the sixth aspect of the presentinvention is easily to manufacture and the manufacturing cost is reducedsince the bookmark body is formed by a single sheet, in addition to theeffects according to the third aspect to the fifth aspect of the presentinvention.

The foregoing and other objects, features, aspects and advantages of thepresent invention will become more apparent from the following detaileddescription of the present invention when taken in conjunction with theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a general view showing the structure of an automatic bookmarkaccording to a first embodiment of the present invention.

FIG. 2 is a front elevational view of a book holding the automaticbookmark shown in FIG. 1 as viewed from a fore edge direction.

FIG. 3 is a diagram showing a state of turning a page sheet of the bookholding the automatic bookmark shown in FIG. 1.

FIG. 4, a diagram corresponding to FIG. 3, is an enlarged view of aportion around a bookmark body.

FIG. 5 are model diagrams showing a state of setting the automaticbookmark shown in FIG. 1 in the book and turning the page sheet, (1)thereof is a diagram as viewed from above the book, and (2) thereof is adiagram as viewed from the fore edge direction of the book.

FIG. 6 is a general view showing the structure of an automatic bookmarkaccording to a second embodiment of the present invention.

FIG. 7 is a partially enlarged diagram around a bookmark body showing astate of setting the automatic bookmark shown in FIG. 6 in a book andturning a page sheet.

FIG. 8 is a general view showing the structure of an automatic bookmarkaccording to a third embodiment of the present invention.

FIG. 9 is a general view of a conventional automatic bookmark.

FIG. 10 is a general view showing a state of putting the automaticbookmark shown in FIG. 9 between the pages of a book.

FIG. 11 is a front elevational view of the book holding the automaticbookmark shown in FIG. 9 as viewed from the fore edge direction.

FIG. 12 is a diagram showing a state of turning a page sheet of the bookholding the automatic bookmark shown in FIG. 9.

FIG. 13, a diagram corresponding to FIG. 12, is an enlarged view arounda bookmark body.

BEST MODES FOR CARRYING OUT THE INVENTION

FIG. 1 is a general diagram showing the structure of an automaticbookmark according to a first embodiment of the present invention.

Referring to the figure, the automatic bookmark 1 is composed of a basesheet 5 in the form of a quadrangular sheet, a coupling body 6projecting outward from a side of the base sheet 5, an elastic body 12connected to an upper side 29 which is the forward end of the couplingbody 6 and bent by forming a plurality of crease lines 15 in parallelwith the upper side 29 and a bookmark body 10 which is anisosceles-triangular sheet connected to an end of the elastic body 12 ona connecting side 30 which is the base thereof. This automatic bookmark1 is formed by punching and folding a sheet of synthetic resin. Thissynthetic resin sheet has elasticity in a bent state and can be easilyfolded since polyethylene, polypropylene, etc. is used therefor.

In manufacturing, the base of the bookmark body 10 is folded along theside substantially perpendicularly to the coupling body 6 with theplurality of crease lines 15 formed in the vicinity of the base of thebookmark body 10 in parallel with the base, and so worked that thebookmark body 10 and the base sheet 5 substantially parallelly opposeeach other. The bookmark body 10 is achromatic and transparent, whilethe elastic body 12 and the base sheet 5 are colored or provided withpatterns.

FIG. 2 is a diagram of a book holding the automatic bookmark of FIG. 1as viewed from the fore edge direction, FIG. 3 is a diagram showing astate of turning a page sheet of the book holding the automatic bookmarkof FIG. 1, and FIG. 4, a diagram corresponding to FIG. 3, is an enlargedview around the bookmark body.

Referring to these figures, the automatic bookmark 1 is set in the book16 by opening pages behind a page desired to be read by a proper volumeand inserting and placing the base sheet 5 into a deep portion betweenthe opened pages, so that the base sheet 5 is fixed between these pagesnot to easily drop. Then, the bookmark body 10 is largely flapped up,for superposing a proper volume of page sheets 17 on the base sheet 5 tolocate the page to be read uppermost. Then, the bookmark body 10 isreturned. At this time, the upper side 26 of the base sheet 5 isrendered substantially flush with the upper surface 20 of the book 16.

According to this, the coupling body 6 and the elastic body 12 projectfrom the upper surface 20 of the book 16, and the bookmark body 10 isbrought into a state substantially parallelly opposing the surface ofany page sheet 17. Thus, the position where the bookmark body 10 is heldcan be easily visually recognized when the book 16 is closed. On theother hand, the automatic bookmark is easy to handle since the same canbe so set that the upper side 26 which is the reference side of the basesheet 5 does not project from the upper surface 20 of the book 16 by theheight of the coupling body 6. While the bookmark body 10 covers thepage sheet 17 when the book is read, the reading is not hindered sincethe same is transparent.

When the page sheet 17 of the book 16 in which the automatic bookmark 1is set as shown in FIGS. 3 and 4, the upper side 25 of the page sheet 17and an inclining side 11 a of the bookmark body 10 come into contactwith each other at a contact 23. When the page sheet 17 is turned fromthis position to a position shown by two-dot chain lines, the contactpoint moves to a contact 24. Following this, the bookmark body 10 isflapped up to a position shown by other two-dot chain lines. The pagesheet 17 is further turned until the forward end of the bookmark body 10passes the upper side 25 of the page sheet 17. When the forward end ofthe bookmark body 10 passes the upper side 25 of the page sheet 17, thebookmark body 10 having been flapped up returns to the original state.

The reason why the page sheet 17 can be easily turned when the side ofthe bookmark body 10 is inclined is now described.

FIG. 5 are model diagrams showing a state of setting the aforementionedautomatic bookmark in the book and turning the page sheet, (1) thereofis a diagram as viewed from above the book and (2) thereof is a diagramas viewed from the fore edge direction of the book. These figures showthe conventional bookmark body 51 in two-dot chain lines while showingthe bookmark body 10 according to the first embodiment of the presentinvention in broken lines.

Referring to these figures, the conventional bookmark body 51horizontally separates by a distance L from the surface of the bookmarkbody 51 present on the original position parallel to the base sheet 5 toa point A where the upper side 25 of the page sheet 17 and the lateralside 55 a of the bookmark body 51 come into contact with each other whenthe page sheet 17 of the book 16 is turned. On the other hand, thebookmark body 10 according to the present invention horizontallyseparates by a distance S from the surface of the bookmark body 10present on the original position parallel to the base sheet 5 to a pointB where the upper side 25 of the page sheet 17 and the inclining side 11a of the bookmark body 10 come into contact with each other when thepage sheet 17 is identically turned. At this time, the distance S isshorter than the distance L as obvious from the figures.

When observing this state from the fore edge side, the conventionalbookmark body 51 is flapped up to an angle θ1 while the bookmark body 10according to the present invention is flapped up to an angle θ2 smallerthan the angle θ1 if the page sheet 17 is identically turned. In otherwords, it follows that the bookmark body 10 according to the presentinvention is less flapped up and consequently requires smaller turningforce when the page sheet 17 is identically turned.

As to the distances of movements from a point C to the point Bindicating the movement of the contact between the page sheet 17 and theinclining side 11 a of the bookmark body 10 and from the point C to thepoint A indicating the movement of the contact between the page sheet 17and the lateral side 55 a of the bookmark body 51, that of the bookmarkbody 10 according to the present invention is longer. While the flap-upangles of the bookmark bodies 10 and 51 are finally equalized with eachother when the forward ends of the bookmark bodies 10 and 51 pass thepage sheet 17, the bookmark body 10 according to the present inventionexhibits a larger angle α for turning the page sheet 17 at this time. Inother words, the bookmark body 10 according to the present inventionexhibits a longer distance of movement for turning the page sheet 17since the bookmark bodies 10 and 51 are flapped up to the same height,whereby force applied for turning the page sheet 17 may be small.

FIG. 6 is a general view of an automatic bookmark showing a secondembodiment of the present invention, and FIG. 7 is a partially enlargedview around a bookmark body showing a state of setting this automaticbookmark in a book and turning a page sheet.

Referring to these figures, the automatic bookmark 1 is constituted of aquadrangular base sheet 5, a pair of coupling bodies 6 a and 6 bprojectingly provided on a side of the base sheet 5, a projecting body13 provided to be held between the pair of coupling bodies 6 a and 6 b,a pair of elastic bodies 12 a and 12 b connected on upper sides 29 a and29 b which are the forward ends of the respective coupling bodies 6 aand 6 b and folded with a plurality of crease lines 15 a and 15 b formedin parallel with the upper sides 29 a and 29 b and a bookmark body 27formed by bonding a pair of bookmark pieces 28 a and 28 b connected tothe forward ends of the respective elastic bodies 12 a and 12 b throughconnecting sides 30 a and 30 b on the forward ends and brought into theform of a V-shaped sheet. This automatic bookmark 1 is formed bypunching a single synthetic resin sheet, similarly to the automaticbookmark 1 shown in the first embodiment.

In manufacturing, the elastic bodies 12 a and 12 b are formed bysubstantially perpendicularly folding the upper sides 29 a and 29 bwhich are connecting portions between the V-shaped bookmark body 27 andthe coupling bodies 6 a and 6 b, further folding the same oppositely tothe coupling bodies 6 a and 6 b in the vicinity of the upper sides 29 aand 29 b and forming the plurality of crease lines 15 a and 15 b inparallel with the upper sides 29 a and 29 b. The bookmark body 27 isworked to substantially parallelly oppose the base sheet 5 through thesecrease lines 15 a and 15 b. While the bookmark body 27 covers thesurface of a page sheet 17 at this time, reading is not hindered sincethe bookmark body 27 is achromatic and transparent. The base sheet 5 andthe elastic bodies 12 a and 12 b are colored or provided with patterns.

The automatic bookmark 1 is set in a book 16 similarly to the firstembodiment.

In other words, the base sheet 5 is superposed on facing pages of thebook 16, for placing a proper volume of page sheets 17 and superposingthe bookmark body 27 thereon. When any page sheet 17 of the book 16 inwhich this automatic bookmark 1 is set is turned, an inclining side 11 aof the bookmark piece 28 a located close to the fore edge of the book 16comes into contact with an upper side 25 of the page sheet 17. Thus, thebookmark piece 28 a forming one side of the V shape is flapped up first.The other bookmark piece 28 b, connected only on the forward end of theV shape, is continuously subjected to transmission of force through thisforward end and flapped up. Thus, this bookmark piece 28 b is flapped upin a delay from the bookmark piece 28 a coming into contact with thepage sheet 17, whereby the overall V-shaped bookmark body 27 is broughtinto a twisted form.

Thus, the V-shaped bookmark body 27 is twisted since the upper side 25of the page sheet 17 comes into contact with the inclining side 11 a.Therefore, force for flapping up the V-shaped bookmark body 27 may besmall, whereby force for turning the page sheet 17 may also be weak andthe operation thereof is smooth. Since the coupling bodies 6 a and 6 bare provided, it follows that the elastic bodies 12 a and 12 b arelocated upward beyond the upper surface 20 of the book 16 also when anupper side 26 which is the reference side of the base sheet 5 is locateddownward beyond the upper surface 20 of the book 16 by the couplingbodies 6 a and 6 b.

The automatic bookmark 1 is so constituted that the upper sides 29 a and29 b which are connecting portions between the coupling bodies 6 a and 6b and the elastic bodies 12 a and 12 b are flush with the upper surface20 of the book 16 when the upper side of the projecting body 13 providedbetween the coupling bodies 6 a and 6 b is rendered flush with the uppersurface 20 of the book 16. Thus, adjustment of the automatic bookmark 1is simplified when the same is set with the projecting body 13. Further,the elastic bodies 12 a and 12 b are so folded that the crease lines 15do not disappear also when the page sheet 17 is repeatedly turned. Thus,the automatic bookmark 1 has durability.

FIG. 8 is a general view of an automatic bookmark showing a thirdembodiment of the present invention.

Referring to the figure, this automatic bookmark 1 according to thethird embodiment corresponds to a shape obtained by omitting thebookmark piece 28 b constituting one side of the V-shaped bookmark body27 of the automatic bookmark 1 according to the second embodiment shownin FIG. 6.

While the V-shaped bookmark body 27 according to the second embodimenthas a shape corresponding to a rightwardly or leftwardly opened book,the automatic bookmark 1 according to this embodiment is useddedicatedly to a rightwardly opened book. As that dedicated to aleftwardly opened book, the bookmark piece 28 a of the automaticbookmark 1 shown in FIG. 6 may be omitted for employing the bookmarkpiece 28 b. When this automatic bookmark 1 is set in a rightwardlyopened book 16 and a page sheet is turned, an inclined side 11 a of abookmark piece 28 a and the upper side of the page sheet necessarilycome into contact with each other. When the bookmark piece 28 b of theV-shaped bookmark body 27 shown in FIG. 6 is thus removed, the bookmarkpiece 28 a can be flapped up with weaker force since only one side isflapped up. Thus, the force for turning the page sheet may be weaker.

While the isosceles-triangular bookmark body is employed in theaforementioned first embodiment, this also has a shape corresponding toa rightwardly or leftwardly opened book. When the direction for openingthe book is limited, therefore, only one corresponding side may incline.Therefore, the shape of the bookmark body may be a right-triangularshape rendering the side close to the backbone perpendicular.

While folding is performed by punching a single sheet in each of theaforementioned embodiments, the molding method may not be restricted tothis but integral molding can be performed with synthetic resin, forexample.

While the crease lines are formed in the elastic bodies in each of theaforementioned embodiments, bending may alternatively be performed incurved shapes. When heat is applied in bending for keeping bent shapesin this case, durability is further improved.

While the coupling bodies are provided between the base sheet and theelastic bodies in the aforementioned embodiment, the elastic bodies mayalternatively be directly connected from the upper side of the basesheet. In this case, the automatic bookmark may be set and used so thatthe upper side of the base sheet and the upper surface of the book areflush with each other.

While the coupling bodies are provided to project from the upper side ofthe base sheet in each of the aforementioned embodiments, the base sheetitself may alternatively be constituted to include a coupling bodyshape.

Although the present invention has been described and illustrated indetail, it is clearly understood that the same is by way of illustrationand example only and is not to be taken by way of limitation, the spiritand scope of the present invention being limited only by the terms ofthe appended claims.

INDUSTRIAL AVAILABILITY

As hereinabove described, the automatic bookmark according to thepresent invention is suitable for an apparatus automatically insertingthe bookmark also when a half-read book is closed as such.

1. An automatic bookmark put between pages of a book, comprising: asheetlike base sheet (5); an elastic body (12) provided on an edge ofsaid base sheet; and a sheetlike bookmark body (10) connected to saidelastic body through a connecting side (30) to extend on a positionopposing said base sheet, wherein a side of said bookmark body extendingfrom one end of said connecting side inclines toward the other end ofsaid connecting side with respect to a surface orthogonal to saidconnecting side from said one end.
 2. The automatic bookmark accordingto claim 1, wherein said bookmark body is in the form of anisosceles-triangular sheet whose base is connected to said connectingside of said base sheet.
 3. An automatic bookmark put between pages of abook, comprising: a sheetlike base sheet (5); a pair of elastic bodies(12 a, 12 b) connected to the respective ones of positions separatedfrom each other by a prescribed distance on an edge of said base sheet;and a V-shaped sheetlike bookmark body (27), connected to the respectiveones of said elastic bodies, extending toward positions opposing saidbase sheet.
 4. The automatic bookmark according to claim 3, wherein saidelastic bodies are provided with at least single crease lines (15 a, 15b) parallel to a line connecting the respective ones of said positionswith each other.
 5. The automatic bookmark according to claim 3, whereinsaid base sheet has two coupling bodies (6 a, 6 b) projecting from oneside thereof, and the respective ones of said elastic bodies areconnected to the forward ends of the respective ones of said couplingbodies.
 6. The automatic bookmark according to claim 3, wherein saidbase sheet, said elastic bodies and said bookmark body are formed byfolding a synthetic resin sheet.
 7. The automatic bookmark according toclaim 4, wherein said base sheet has two coupling bodies (6 a, 6 b)projecting from one side thereof, and the respective ones of saidelastic bodies are connected to the forward ends of the respective onesof said coupling bodies.
 8. The automatic bookmark according to claim 4,wherein said base sheet, said elastic bodies and said bookmark body areformed by folding a synthetic resin sheet.
 9. The automatic bookmarkaccording to claim 5, wherein said base sheet, said elastic bodies andsaid bookmark body are formed by folding a synthetic resin sheet. 10.The automatic bookmark according to claim 7, wherein said base sheet,said elastic bodies and said bookmark body are formed by folding asynthetic resin sheet.